3y+12y=90

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Solution for 3y+12y=90 equation: 



3y+12y=90

We move all terms to the left:

3y+12y-(90)=0

We add all the numbers together, and all the variables

15y-90=0

We move all terms containing y to the left, all other terms to the right

15y=90

y=90/15

y=6

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